Postfix cannot work normally after myhostname changed ?

All my client's email route to my administrative account whenever I use catchall or not !!!

I have searched the related forums but cannot get help. After I have changed myhostname from AAA.com to BBB.com in main.cf, I restart everything even reboot the server, abnormal thing happened.
All virtual domain user's incoming email routed to the administrative account of BBB.com, whenever I check or uncheck the catchall box. The outgoing email from virtual domains are sent out correctly with their virtual domain name.

Forgive my less knowledge in mailserver and ispconfig setting, I wonder the myhostname must use mail.BBB.com and cannot use the same hostname of BBB.com ?

Better use something like server. BBB.com or mail.BBB.com as myhistname in postfix or you can not use BBB.com as website on your server.

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Hi Till,

Thanks for your prompt reply, it is useful info for me. Your meaning is; when I use BBB.com as mail server, then BBB.com cannot use as website. But how about if I only use BBB.com as mail server and http://BBB.com use ispconfig default index page, if this workable?